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When ice shelves lose large chunks, it does not raise sea level because these
bodies are already afloat. However, the loss of an ice shelf can speed up the
seaward flow of the nonfloating glacial ice behind it, and this ice can in turn
contribute to sea-level rise. Researchers have estimated that the loss of all
the ice that the Larsen C ice shelf currently holds back would raise global
sea levels by 10 centimetres.
If you have a family of 4, you can think of it as the equivalent of a 15 mpg vehicle for domestic flight and 22 mpg vehicle for international flight. So somewhere in the range of a full-size pickup truck.
But -- when you fly, you go very far. If you go on vacation to Hawaii from San Francisco once a year with your family, that's the equivalent of driving a Ford F-150 for 5000 miles. If you visit India or China that's 15,000 Ford F-150 miles! In a single trip, more than what most people drive in an entire year!
So you can make a big difference just preferring local vacations instead of remote ones.